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19. Commonly Seen Alarms
19.0.1 High Pressure Alarm
If the PIP is above the user set alarm threshold, this alarm is generated. If the
alarm thresholds are not set by the user, the ventilator automatically sets the
alarm thresholds 5 mbar above the set PIP in conventional modes of ventilation.
The low pressure threshold is automatically set at 1mbar on power and should
not be adjusted to a level below that.
(SLE5000 Only). The alarm thresholds are set 10 mbar above and below peak
pressure in HFO. If the PIP is more than 5 mbar above the alarm limit, the gasses
will be cut and the ventilator will attempt to restart HFO within 6 seconds.
Action: If the patient condition has remained unchanged and does not require an
increase in PIP, adjust the high pressure alarm threshold.
19.0.2 Low Pressure Alarm
If the pressure is below the user set alarm threshold, this alarm is generated. At
power up the low pressure alarm is set to a level of 1 mbar. This may be
increased, but it is advised that this level not be decreased. Decreasing this level
will take the alarm threshold into the negative and a disconnection alarm will not
be generated for 10 seconds when “Breath Not Detected” is recognized.
Action: Check patient condition. Check patient circuit for any sign of leaks e.g.
watertrap has not been correctly closed; temperature probe may have loosened
or disconnected.
19.0.3 Breath Not Detected
If the ventilator does not see any patient effort within 10 seconds of delivering a
mechanical breath a “Breath Not Detected” alarm is generated. The ventilator has
to see both inspiration and expiration to recognize a breathe.
Action: Check patient effort. If there is patient effort, something else to check
would be ET tube patency. If the tube is blocked only inspiration would be seen. If
there is a large leak, the patient would not be able to reach the trigger threshold,
therefore an inspiration and expiration would not be detected and a “Breath Not
Detected” alarm sound.
In patient interactive modes i.e. SIMV, PSV,PTV,CPAP the breath detection
threshold level my need adjusting to ensure that all patient efforts are captured.
19.0.4 Low Tidal Volume
The measured volume is below the selected alarm threshold. This can happen on
switching between modes. When in triggered modes of ventilation, every breathe
may be different and if the tidal volume alarm threshold if not set at a level to
capture all breaths then this alarm will be generated.
Action: Watch triggered breaths and set tidal volume alarm level at the
appropriate level.
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